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A HRB 04:35 nos encontramos en posición GPS l: 35º 58,0 `N L: 006º 00,00`W poniendo rumbo a la Farola del puerto de Tánger (Fl 312s14M) con velocidad de máquinas 7 nudos, navegamos en zona de corriente de rumbo=110º e intensidad de corriente (Ihc)= 2 nudos .Calcular hora de llegada a Tánger.At HRB 04:35 in GPS position l: 35º 58.0' N, L: 006º 00.00' W you head for Tangier port light at 7 knots engine speed in a current setting 110º at Ihc = 2 knots. Calculate your time of arrival at Tangier:
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Correct answer: d) 06:13
Why it is correct
From 35º 58.0′ N, 006º 00.0′ W to Tangier port light (35º 47.4′ N, 005º 48.2′ W) is 14.2 miles along effective course Ref = 138º. Solving the current triangle (Rc = 110º, Ihc = 2 knots, Vm = 7 knots) gives effective speed Vef = 8.70 knots; time is 14.2 / 8.70 = 1.63 h (1h 38m) ⇒ arrival at 04:35 + 1h 38m = 06:13.
Why the others are not
- a) Does not compute the time with effective speed Vef = 8.7 knots over the 14.2 miles to Tangier.
- b) Does not compute the time with effective speed Vef = 8.7 knots over the 14.2 miles to Tangier.
- c) Does not compute the time with effective speed Vef = 8.7 knots over the 14.2 miles to Tangier.
How to work it out in the exam
- Measure the distance (14.2 miles) and effective course (138º) from 35º 58′ N, 006º 00′ W to Tangier.
- Find Vef = 8.7 knots from the current triangle ⇒ t = 1h 38m ⇒ arrival at 06:13.
Where this question comes from
- Región de Murcia · 2025 · 1ª convocatoria · PY Tipo 1 · question 35 Official paper · Official answer key
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Pending instructor review. Machine translation, not reviewed.